| abstract |
A plate (3) on which a sample (4) is mounted is set at a stage (2). An observation image of the sample is picked up by a CCD camera (14) and the image is stored at an image data memory unit (23). An operator then takes out the plate (3) and sprays a MALDI matrix on the plate and again sets the plate (3) at the stage (2). After that, when a predetermined operation is carried out, a clear observation image of the sample picked up before spraying the matrix is displayed on a display unit (24). An analyzing position or region is designated on this image. Although setting and taking out the plate (3) causes the position of the sample (4) a possible shift, an image analysis processing unit (44) calculates a direction or an amount of the position shift by recognizing a position of marking set on the plate, and a position shift correcting unit (42) calculates coordinates to correct the position shift. With this, even if a position shift exists, a highly accurate mass analysis on an real sample can be carried out for a position or region designated on the clear observation image before spraying the matrix. |